seymour



FREDERICK I. SEYMOUR, OE WOLCOTTVILLE, CONNECTICUT..

Lettere .Patent No. 75,302, dated March 10, 1868.`

IMPROVEMENT IN METAL-TOP LAMP-GHIMNBYS.

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se einem niet I, FREDERICK I. Semoun, of Wetgeving, .in the countypf Lachend, and Seite of con. necticut, have invented and made a certain n ew and nsefulilmprovemerit in LampChimneys; and I do hereby declare the following to be a full, clear, and exact description of the said invention, rei`erenoe being had to the annexed drawing, making pnrtofpthis specication, wherein- Figure 1 is a vertical section of my improved metal cap es applied to the glass chimney,.and

Figure 2 is an inverted sectional plan of the metal cap. I

Similar marks of reference denote the same parts.

Lamp-chimneys have heretofore been madetin which a metal `cap or top is applied to a glass bulb or short chimney, as in Letters Patent granted to E. BrownfMarch 25, V1862. These are made of thin sheet metal spun up, and, in consequence of being of a definite size, require glass bulbs of accurate construction, in order that the metal and glass may fit .properly together. This increases the cost of the glass, and the metallic extension is also costly, as nothing but brass, or a metal that can be spun up, will answer for such tops. In order to allow for variations in the sizeof the glass, a. cone of. sheet metal has been employed, the edges lapped, and small flanges attached to the exterior, as seenin Letters Patent granted to Townsend, March l, 1864, but this is liable tobecorne warped by the action of the heat,V and is not reliable either in its attachment to the glass,

or in being suiciently tight to operate properly.

The nature oi' my said invention consists in asheet-'tetal'cone for a lamp,chimrrcy,bent up to form, with the edges lapped,` and con-nectedtogether by a rivet near the smaller .end of the conical cap, 'so as to hold the parts together at this point, and I form a shoulderfor setting within the glass chimney by means of a bead, bent up in the sheet meta-l, and containing an expansive open ring of wire, which insures airm connection of the sheetmetaleap te the glass chimney, even though the opening in said glass chimney may not be accurate in size, and the heat of the lamp will'not injure the shape or firm attachment of the cap to the glass.

IVIysheet-metal cap isA durnble, can be made of sheet iron, or other cheap metal,`and hence can be sold at a low price. i u I' In the drawing, a represents thevglass chimney, of any usual size or shape. "Zz is my improved sheet-m`etal cap, formed as 'a truncated cone, the edgesof which sheet metal are lapped and secured together by a. rivet at 2, which allowsthe base to he contracted or expanded. Around the base ofthe cone, a bead, 3, is bent up' in the sheetmetalfto form a shoulder to set within the glass chimney, and within this bead 3 an open wire ring, 4,' is introduced, and by its expansive-force keeps the base of the sheet-metal cone tightly against the inside of the glass chimney, l i

The bead 3 maybe any desired shape sectionally, and may vb e ornamented with milling, or in imitation of a rope, or otherwise. i

What I claim, and desire to secure by Letters Patent, is

1. Connecting the'lapped edges of the sheet-metal cap, near the upper or smaller endrby means of a rivet, or its equivalent, for the purposes and substantially as set forth.' I

2. An expansive ring,` introduced in thebe'ad formed near the base `of the sheet-metal cone, for the pur poses and'suhstantially as set forth. Y I

Inwitness whereof, `Ihave hereunto set my signature, this twenty-third day of January, A. D'. 1867.

i FREDK. SEYMOUR.

Witnesses: I

Giras. E; SMITH', GEO. D; WALKER. 

